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Proceedings Paper

Effect on conductance of an isomer state in a quantum point contact
Author(s): P. E. Lindelof
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Paper Abstract

We describe a novel phenomenological model for transmission through an adiabatic 1-dimensional constriction, where the electronic configuration around the middle of a quantum point contact can be in two configurations: the usual ground state with spin neutrality (S equals 0) and a higher (virtual) isomer with an uncompensated electronic spin (S equals 1/2), which modifies the conductance at higher temperatures, where it is thermally populated, giving rise to the so-called 0.7 structure. Bias spectroscopy reveals the energy difference between the two isomers. The isomer reflects the charge/spin separation in the middle of the constriction. The high energy isomer is a spin 1/2 state (but not magnetically ordered), and will not directly contribute to the transmission unless temperature is high or biasing allow a Kondo-like resonant transmission. The resonant transmission represents a reduction in conduction from the fully quantized value, 2e2/h.

Paper Details

Date Published: 10 April 2001
PDF: 9 pages
Proc. SPIE 4415, Optical Organic and Inorganic Materials, (10 April 2001); doi: 10.1117/12.425474
Show Author Affiliations
P. E. Lindelof, Univ. of Copenhagen (Denmark)

Published in SPIE Proceedings Vol. 4415:
Optical Organic and Inorganic Materials
Steponas P. Asmontas; Jonas Gradauskas, Editor(s)

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